Suzanne Starr and husband Tim, from Môn-Stir Sauce, produced the mango and sweet chilli sauce to mark the Diamond Jubilee. They sent it to Buckingham Palace and Prince Charles.

Now they have received a letter to tell them the sauce was now in the Buckingham Palace kitchen.

They have also received a letter from the personal secretary of the Prince of Wales who said Charles also liked the sauce.

Suzanne, 50, who set up the company in Beaumaris 18 months ago, said: “We learnt that the Coronation sauce was made 60 years ago to mark when Elizabeth came to the throne.

“We thought it would be nice to make a sauce to mark the Jubilee. We looked at what the Queen liked and found out she had a sweet tooth. We have worked with the Prince’s Trust and they urged us to send a jar to Buckingham Palace and Prince Charles.

“We didn’t expect to hear anything back but now a letter has arrived from the Palace saying that the sauce is now in the Buckingham Palace kitchen, so we believe the Queen is a fan. We were then contacted by the office of Prince Charles who said he liked the sauce. The Trust is now looking to support us with a mentor so we can keep developing the company.”